One month ago I installed Ubuntu9.04 into my Fujitsu Lifebook V1020. I almost uses it everyday. I love it even having some features which does not work well, but i think it'll be fixed one day. Now it's my working "machine".
b) Seamonkey, i found this, so just wanted to use and try.
c) KiCad, it's a GPL'd suite of programs for EDA (Electronic Design Automation). I am learning it.
d) GitHub, it's kind of hard to me, but i keep using it